Core component of fuel cells

In fuel cells, an ion exchange membrane is installed to generate electrical energy through the chemical reaction of hydrogen and oxygen. To make fuel cell vehicles more popular for the eventual achievement of a low-carbon society, it is essential to do two things: to develop a hydrogen infrastructure and to make fuel cells more compact for use in automobiles, etc. In respect to the latter, AGC Group has been promoting the development and practical use of membrane-electrode assemblies (MEAs) as a core component of polymer electrolyte fuel cells, which enable them to be smaller and lighter. To be used in automobiles, fuel cells are subjected to severe conditions (temperatures of 100°C or higher and low humidity), and so the MEAs used in the cells must have high durability. Using the technology that we have accumulated in the development of fluoropolymer ion-exchange membranes, we have created a highly durable MEA that can be operated continuously for 6,000 hours or longer at above 100°C and at 50% or lower humidity. This MEA is expected to be put into practical use, ahead of other MEA products.

Structure of MEA and fuel cell

MEA	Power generation by a fuel cell
A MEA consists of a proton exchange membrane and electrodes in a single unit. Sandwiched between separators, these can be packed on top of each other to form a stack. Together with peripheral devices, the stack forms a fuel cell system for clean power generation.	In a fuel cell, a membrane combining an ion exchange membrane and an electrode with dispersed catalyst, known as a MEA is installed between the hydrogen and the oxygen supplies to enable ion exchange and power generation.